diff --git a/app/Classes/Modules/Transactions/ControllersLogic/ShippingEstimationCalculatorLogic.php b/app/Classes/Modules/Transactions/ControllersLogic/ShippingEstimationCalculatorLogic.php
index f3b25c66..753704a0 100644
--- a/app/Classes/Modules/Transactions/ControllersLogic/ShippingEstimationCalculatorLogic.php
+++ b/app/Classes/Modules/Transactions/ControllersLogic/ShippingEstimationCalculatorLogic.php
@@ -45,24 +45,20 @@ class ShippingEstimationCalculatorLogic extends AbstractControllerLogic
         $cbm = (float) ($width * $length * $height);
 
         // calculate base price
-        $base_rates = $this->fetchesSegmentConstant->execute(['segment_id' => 1, 'reference' => SegmentConstants::BASE_PRICE]);
-        $base_prices = (array) $base_rates->value;
-        $base_price  = array_key_exists(date('Y-m-d'), $base_prices) === true ? $base_prices[date('Y-m-d')] : 0;
+        $base_prices = $this->getSegmentConstantData(SegmentConstants::BASE_PRICE);
+        $base_price  = $this->getConstantDataUsingKey($base_prices, date('Y-m-d'));  
 
         // calculate warehouse rate
-        $warehouse_rates = $this->fetchesSegmentConstant->execute(['segment_id' => 1, 'reference' => SegmentConstants::WAREHOUSE_RATE]);
-        $warehouse_prices = (array) $warehouse_rates->value;
-        $warehouse_rate = array_key_exists($request->input('warehouse_id'), $warehouse_prices) === true ? $warehouse_prices[$request->input('warehouse_id')]->amount : 0;
+        $warehouse_prices = $this->getSegmentConstantData(SegmentConstants::WAREHOUSE_RATE);
+        $warehouse_rate  = $this->getConstantDataUsingKey($warehouse_prices, $request->input('warehouse_id'), 'amount'); 
 
         // calculate applied state rate
-        $state_rates = $this->fetchesSegmentConstant->execute(['segment_id' => 1, 'reference' => SegmentConstants::STATE_RATE]);
-        $state_prices = (array) $state_rates->value;
-        $outstation_postcodes = $this->fetchesSegmentConstant->execute(['segment_id' => 1, 'reference' => SegmentConstants::OUTSTATION_POSTCODE]);      
-        $outstation_postcodes = (array) $outstation_postcodes->value;
+        $state_prices = $this->getSegmentConstantData(SegmentConstants::STATE_RATE);
+        $outstation_postcodes = $this->getSegmentConstantData(SegmentConstants::OUTSTATION_POSTCODE);
 
         $district = District::where('postcode','LIKE','%'.$request->input('postcode').'%')->first();
         if(array_search($request->input('postcode'), $outstation_postcodes)!==false){
-            $state_rate = array_key_exists($district->state_id, $state_prices) === true ? $state_prices[$district->state_id]->outstation : 0;
+            $state_rate = $this->getConstantDataUsingKey($state_prices, $district->state_id, 'outstation'); 
         }
 
         $price_cbm = $base_price + $warehouse_rate + $state_rate;
@@ -74,4 +70,23 @@ class ShippingEstimationCalculatorLogic extends AbstractControllerLogic
         ]);
     }
 
+    private function getConstantDataUsingKey($data, $search_key, $field='')
+    {
+        if(array_key_exists($search_key, $data) !== true) {
+            return 0;
+        } else {
+            if($field!=''){
+                return $data[$search_key]->$field;
+            } else {
+                return $data[$search_key];
+            }
+        }
+    }
+
+    private function getSegmentConstantData($reference)
+    {
+        $data = $this->fetchesSegmentConstant->execute(['segment_id' => 1, 'reference' => $reference]);
+        return (array) $data->value;
+    }
+
 }